Western Pacific Railroad freight train symbol WPX at Williams Loop

East of Quincy the railroad makes a complete loop just like the Southern Pacific built at Walong. However, since the Western Pacific was built with a maximum grade of just one percent, the Williams Loop is not quite as impressive. On July 8, 1979 train WPX encircles itself at the loop. Disk 27

Engines 3004, 3067. 3053, and 3051 briefly chase the cabooses on the rear as the train coils around the loop.